1. Department of Neurology, Yonsei University College of Medicine, Seoul, Korea.
2. Integrative Research Center for Cerebrovascular and Cardiovascular Diseases, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Neurology, Brain Research Institute, Keimyung University School of Medicine, Daegu, Korea.
4. Department of Neurology, National Health Insurance Service Ilsan Hospital, Ilsan, Korea.
5. Department of Neurology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
6. Department of Neurology, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
7. Biostatistics Collaboration Unit, Yonsei University College of Medicine, Seoul, Korea.